I found that, You may be paid wrong currency for the colocation service. The service fee THB40,000 per month. But, you paid to us USD40,000. (please see the advice payment)
So, we use the money your paid to be deducted with the all invoices as following:
Therefore, the balance amount paid over 1,038,438.23 baht (=USD31,936.36 /exchange rate@32.5168). Do you want refund transfer or deduct the next billing cycle?